Tension and let-off device



' c. v. J. CHRISTENSEN TENSION AND LET-OFF DEVICE Filed August 10, 1922 4 sheets sheet 2 Aug. 10 1926. 1,595,380

C. V. J. CHRISTENSEN TENSION AND LET-OFF DEVICE Filed August 10, 1922 4 Sheets-Shoot 3 Aug. 10 1926.

c. v. J. CHRISTENSEN TENSION AND LET-OFF DEVICE Filed August 10, 1922 Sheets-Sheet 4 Iii 111 /Zf077z Patented Aug. 10, 1926.

siren STATES PATENT OFFICE.

CARL V. J. CHRISTENSEN, 6F ATTLEBORO, MASSACHUSETTS, ASSIGNOR TO WARD- WELL BRAIDENG MACHINE COMPANY, OF PORTLAND; MAINE, A CORPORATION OF MAINE.

TENSION AND LET-OFF DEVICE.

Application filed August 10, 1922. Serial No. 580,908.

This invention relates to improvements in tension and let-off devices for controlling the delivery of yarn and thread from supply cops or bobbins for various uses in teX- tile machines. v

One object of the improvement is to provide for a more sensitive and accurate control of the tension on the strand as it is delivered from the bobbin.

Another object of the improvement is to provide for greater uniformity in thetension of delivery of the yarns from a plurality of supplies.

Another object of the improvement is to provide for a more delicate adjustment of the amount of tension applied to the yarn in cordance with varying requirements.

Another object of the improvement is to provide for maintaining amore constant tension on the strand under normal conditions without fluctuations liable to be caused by irregularities in the winding of the bobbin.

2th r objects of the improvement are to simnl f construction of the tension and nee .nism,to render the deviw more mical to manufacture; and to provide 'reater ease and convenience in its adand manipulation.

l urther objects of the improvement t iorfh in the fol owing specification descrioes several preferred embodiments the invention as illustrated by the ying drawings. In the drawings:

side elevation of one embodiment of the invention, showing the tension and let-oft device as applied to the sliding car er of a rotary braiding machine;

w 2 is a plan view of the same;

if 3 and. 4 are enlarged detailed views of the tension and letoif mechanism of the device illustrated in Figs. l and 2 with the parts thereof shown in different operative positions;

F'g. 5 is a plan view of the same in part on on the line 5-5 of Fig. 1; 1g. 6 shows a modified form of the device applied to the stationary supplyholder of a braiding machine or foruse with other tensile apparatus;

Fig. 7 an inverted plan View of the Fl 8 is a detailed view of the mounting for he tension-lever;

Fig. 9 is a side elevation of another form of braider-carrier for use on a different type of machine, showing the improved tension and let-off device applied thereto;

Fig. 10 is a detailed view of the tension and let-off mechanism therefor; and

Fig. 11 is a plan View of the same.

, Referring first to Figs. 1 and 2, the present improvements are herein shown as applied to use on abraider-carrier 2 which is adapted to travel in a circular-orbiton the machine. The carrier 2 is. of well known construction comprising a substantially flat, lentiform deck 3 from which depends an arcuate keel orrunner 4 adapted to slide in the circular groove or raceway disposed concentric with the axis of the machine. Risingvertically above the deck 3 is a rotatable mandrel or cop-holder 5 provided with spurs 6 on its sides which engage the interior of the bore of the paper or wood coptube 7 on which the yarn is wound in the form of a cylindrical package 0, indicated in the drawings by dot-and-dash lines. At the base of the mandrel or cop-holder 5 is a brake-wheel or ratchet-disk 10, which is preferably scored on its rim with fine serrations or teeth 11.

Rising from the deck of the carrier 2 at the side of the brake-wheel 10 is a post 12 carrying a vertical guide-rod 13 around which the yarn or other'str'and s is led as it delivers from the rotating cop C. At the opposite side of the cop-holder 5 is a vertical standard 15 provided at its upper end with a guide-eye 16 through which the strand .9 is led from the guide-rod 13. The standard 15 serves its main purpose in providing a mounting for the tension and let off mechanism which control the paying oil of the strand 8 from the cop C. Adjacent the base of the standard 15 are a pair of opposite ears 17 having holes for receiving a rod or pin 18 which serves as a pivot for a rockable detent or pawllever 20. The pawl-lever 20 is of yokeshape, see Fig. 5, with the forward crossbar 21 of its yoke provided with a depending toe 22 which reaches out toward the rim of the brake-wheel 10 and is beveled at its end to adapt it to engage the serrations or teeth 11 thereon. One of the arms 23 of the lever 20 is provided with an elbow-shaped extension 24 arranged with shape in side view, see Fig. 3, and are con nected by a cross-plate 29 formed with a projecting guide-hook around which the strand 8 is looped as it draws down from the guide-eye 1G and then bacx through the I eye as shown in Fig. 1. The angular shape of the arms 27 is designed to permit the lever 26 to rock downwardly to a consider able extent, see Fig. 3, before the edges of the arms strike against the pivot-pin 18 which supports the pawl-lever 20. One of the arms 27 is provided with an extension 31' bent at right-angles and formed with a hole 32, see Fig. 5.

Referring to Fig. 3, a helical spring 33 has its end hooked through the hole 32 and is anchored at 34- to an ear 35 projecting from the top of the standard 15. The ear or lug 3.5 is preferably adjustable in height on the standard 15 to regulate the tension of the spring 33; the means for adjusting the ear being of any suitable construction as heretofore used in the art. The spring 33 tends to rock the tension-lever 26 on its pivot 25 to depress its outer end carrying the guide-hook 30, it being noted that the distance between the pivotal axis of the lever and the point of application of the spring pressure is relatively short so that the leverage. of the spring is comparatively slight. In other words, the spring-pressure is reduced to the minimum so that the tension-lever will yield easily under slight fluctuation in the resistance to the draft of the yarn or strand 8 as the latter draws through the guide-hook 30. It is also to be noted that the spring 33 has a two-fold function in that its tension on the tension-lever 26 also acts through the pivot 25 to exert a lifting force on the pawl-lever 20. This latter force is compounded through the arm 27 of the lever 26 so that the spring exerts considerable more tension on the pawl-lever than on the tension-lever. Through this arrangement the tension-lever is adapted to fluctuate freely to compensate for slight variations in the draft on the yarn, while the pawl-lever 20 is normally held raised with its toe or detent 22 maintained in engagement with the teeth 11 on the brakewheel 10. Then the draft on the yarn or strand 3 requires the unwinding of more material from the bobbin or cop G the ten.- sion-lever 26 is rocked upwardly until its plate 29 strikes against the under side of he elbow-shaped arm 24 of the pawl-lever O, whereupon the latter will be rocked on its pivot 18, in the manner as illustrated in Fig. at to release its detent 22t'rom the teeth 11 on the brake-wheel 10 to permit tl e cop-holder 5 to rotate.

Extending upwardly from the side of the tension-lever 26 is a curved arm 36 provided with a cylindrical finger 37 at its end which engages a Vshaped slot 38 in a dagger-like drop-wire 4.0. The drop-wire a0 is adapted to slide vertically in a slot in the base of the standard 15, being guided in its movement by a slotted lug tl at the top of the standard. The drop-wire is normally held in raised position by the finger 37 hearing on the rounded edge of the slot 38 as the tension-lever 26 fluctuates slightly across its mean central position. When, however, the lever 26 is carried to extreme downward or upward position, as illustrated respectively in Figs, 3 and 4:, the finger 37' on its arm 36 rides out to the end of the slot 38 and allows the drop-wire 40 to descend sufliciently for it to engage with a trip or knock-0E device which releases the stopping mechanism of the braider or other machine to which the present invention is applied. The arrangement of the drop-wire so for cooperation with the stopping-mechanism of t the braiding machine is shown and described in U. S. Letters Patent No. 1,082,981, issued to Simon WV. Wardwell, December 30, 1913, and therefore will not herein be explained in detail.

The above described embodiment of the invention is applied to use on a braiding machine in the manner as next explained: The carriers 2 carrying the bobbins of one series or set of supplies are arranged to slide in a circular raceway which is concentric with the axis of the machine and with the braiding point of the fabric. The bobbins or cops C usually take the form of cylindrical packages wound on paper cop-tubes 7 which are slipped onto the holders 5 and held rotatively with the brakewheel 10 by means of the spurs 6 engaging the interior of the tubes. The yarn or strand 5 from each suppl -cop C is led first around the guide-rod 13, thence through the guide-eye 16 on the standard 15, down around the guide-hook 30, and back again in a loop or bight to the guide-eye 16. From the guideey-e 16 the strand 8 leads up to the braiding point at the axis of the machine, it being understood that there are a series of strands lead ing from the carriers for this set of supplies which are spaced at intervals around the machine, the yarns thus forming a mat or shed into which a second series of strands are woven. The strands of the other series are delivered from a second set of carriers arranged to revolve about the axis of. the machine in a direction opposite to that of ill) the carriers 2 and the interlacing of the strands is effected by a system of switches or the like which direct the strands from one set of supply-cops in and out around the carriers 2. As the strands from the cops C on the carriers 2 are taken up by the braiding operation the draft on the yarn will cause the tension-lever 26 to be raised against the resistance applied by the spring 33 on the short arm of the lever. Under normal conditions the lever 26 will play up and down to a slight extent while maintaining a relatively light tension on the strand. At intervals in'the movement of the lever 26 its plate will be'engaged with the elbow extension. 24 on the pawl-lever 20 whereby to rock the latter slightly to release its detent 22 from the teeth 11 on the brake-wheel 10. Under conditions of high speed of operation of the braiding mechanism the play or oscillation of the tension-lever. 26 will cause an intermittent release and engagement of the teeth 11 on the brake-wheel 10 so that the latter is allowed to rotate with a step-by-step motion to pay off the yarn from the cop C under the constant control of the detent or brake device. In this way the rotation o1 the cop-holder is regulated to deliver the yarn from the cop in direct proportion to the take-up of the strands at the braiding point and a substantially constant and uniform tension is maintained on all of the strands delivering from the sev eral carriers.

Fig. 3 of the drawings illustrates the lever 26 at the lowermost point with its arms 23 resting on the pivot-pin 18 of the pawl-lever 20. The lever 26 assumes this position only when the yarn or strand 8 is unduly slack or broken, in which case it i will be noted that the finger 37 on the'curved arm 36 oi": the lever rides out to the end of the V-shaped cam-slot 38 on the drop-wire whereby the latter is allowed to drop to effect the stopping of the machine. Normally, while the machine is in operation, the lever 26 will be held partly raised under the draft on, the strand 8, assuming a substantially mean central position as shown in Fig. 1. The finger 37 on the curved arm 36 of the lever 26 is thus caused to bear on the rounded point at the apex of the camslot 38 so as to'maintain the drop-wire 40 lifted sufiiciently to prevent its contact with the knock-oil devices which control the stopping mechanism of the machine. The lever 26 may have a slight oscillating motion to either side of its mean central position without permitting the drop-wire 40 to descend to an extent sufficient to trip the knockoff devices. This slight play of the lever 26 maintains the strand 8 normally taut as it delivers to the braiding operation and as the lever 26 moves upwardly at intervals its plate 29 acts against the elbow extension 24 on the lever 20 to rock the latter to release its pawl or detent 22 from the teeth 11' on the ratchet-disk or brake-wheel 10, as before explained. It will be noted'b-y reference to Fig. 2 that the teeth 11 onthe disk 10 are relatively fine so that only a slight lifting movement 01" the tension-lever 26 is required to rock the pawl-lever 20 to release the brake-wheel 10 whereby to permit the rotation of the cop-holderto pay oil more i lifted quickly to its full extent, as illustrated in Fig. 4, thus causing the finger 37 on its arm 36 to ride out to the end of the cam slot 38 to lower the drop-wire 40'to cause it to release the knock-oil devices. In this manner the operation of the machine is arrested practically instantaneously to prevent breakage of the tangled or caught strand.

Figs. 6 and 7 0t the'drawings illustrate a modified form of the tension and let-off devices as applied to use on the carriers for the second set of bobbins employed on acircular type of braider. The carriers may; consist of brackets 48 which are supported on and revolve with a rotary head or turret, not herein shown. The bracket 43 is provided with a fixed spindle 44 carrying a rotating cop-holder 45 of substantially the same form as that previously described. The cop-holder 45also has a brake-wheel 46' at its base, but in this embodiment the ratchet-teeth 47 are formed on the insideo't the rim of the wheel, see Fig. 7. Adjacent the cop-holder 45 a standard 48 rises from the bracket 43, and'in its side is a slot 49 adapted to serve as a bearing for a vertical shaft or rod 50. The rod 5O is held in place in the slot 49'byn1eans ot' a clamp 51 which is riveted to the side of the standard 48 and formed with hooked ears having their curved ends adapted to close the side of the slot at top and bottom The rod has a loose lit in the slot 49 whereby it may turn freely in its bearings and also have a slight lateral play at its lower: end for a purpose as laterexplained. The upper end of the rod 50 is bent at right-angles to provide an arm or tension-lever 55 which is flattened along its length and formed with a guide-eye 56 at its outer end.

The rod 50 projects below the bottom of the bracket 43 and is bent into a loop 5'7 which is extended outwardly in a rightangled arm 58. A helical spring 60 is hooked into the loop with its opposite end attached at 61 to an arm or lever 62. The lever 62 is pivoted on a pin 63 driven into the under side of the bracket 43 and its outer end is bent up across the edge of the outer curved rim on the bracket 43 to adapt it to engage with a series ct teeth 64 formed on the upper beveled surface of the rim. By shifting the lever 62 to engage the diiterent teeth 64 the tension of the spring 60 may be adjusted to vary its force in resisting the turning movement or" the tension-lever 55.

Pivoted on a stud 65 on the under side of the bracket 43 is a pawl-lever 66 provided at its end with an ofiset pawl or detent 67 adapted to reach in under the edge of the brake-wheel 46 to engage with its ratchet-teeth 47. The lever 66 is held in place in a slot 68 cut into the side of a lug 69 on the bottom of the bracket 43 The pawldever 66 is formed with a forked arm T0 projecting from the side of its pivotal axis and adapted to embrace the lower end of the rod 50. An extension 71 on the arm 70 is formed with a downwardly bent finger 72 which is adapted to be engaged by the arm 58, which projects from the lower: end of the rod 50, when the rod turns on its aXis under the swinging action of the tension-lever 55, see dotted lines in Fig. 7.

The method of operation of this modified form of the invention is substantially the same as that in the embodiment first described. The strand 8 leads oh from the side of the cop C, draws through the guideeye 56 at the end of the tension-arm, and thence may lead across a guide-rod or other deflecting means direct to the braiding point. In the circular type of braider, for which the present carriers are adapted, the yarns s are manipulated to cause them to play radially in and out as they revolve about the axis of the machine to pass them to one side or the other of the carriers 2 carrying the other set of supplies or bobbins C. As the strands s ride across the edges of the lentitorm decks 3 of the carriers 2, see Fig. 2, the yarn must be paid out and then taken up with a give-and-take action in accordance with the deflection of each strand as it passes by the carrier. This alternate give-and-take of the strand is com pensated for by the swinging action or" the tension-lever 55 under the control of the spring 60. To provide for the delivery of the yarn as it is taken up by the braiding action the pawl-lever 66 must be released from the brake-wheel 46 to permit the retation of the cop-holder 45. The release of the pawl-lever is effected by the action of the arm 58 on the lower end of the rod 50. As the draft on the yarn is continued the tension-lever 55 will be swung into the position illustrated by dash lines in Fig. 7, at which juncture the side of the arm 58 wilbring up against the finger 72 on the extension 71 of the pawl-lever 66. A slight further movement of the tension-lever will therefore act to cause the arm 58 to rock the pawl-lever whereby to release its detent 67 from the teeth 47 on the brake-wheel 46. It will be understood that normally the pawllever 66 is held in engagement with the teeth 4'? on the brake-wheel 46 by the action of the spring 60. That is to say, the pressure of the spring acts directly on the arm 58 ot the rod which carries the tension-lever and since the rod a slightly loose or shackly beari g its lower end,'as before lained the spring will have a tendency to move the rod laterally to cause it to exert a pressure on the forked arm 70 of the pawl-lever 66. Stated briefly, the spring causes a drying action oi the rod 50 on the arm of the pawl-lever 66 the latter to maintain its detent 67 engaged with the teeth 42' is also to be noted that since the arm 58 which acts on the arm 70 of the pawl-lever to release the latter is pivoted on a ditierent axis from that of the pawl-lever, then the lower end of the rod 50 must move laterally to permit the rocking of the pawllever. is for this purpose that the rod 50 is loosely mounted in its hearings to allow the lateral play at its lower end. From the foregoing it will be observed that the spring 60 has the same two-told action as that of the spring 33 in the arrangement of mechanism first described. In other words, only one spring is required in either case for controlling both the tension-lever and pawl-lever and the arrangement is such that the pressure of the spring on the tension-lever is much lighter than on the pawllever so that the former may exert the required delicate control on the yarn or strand.

In Fig. 9 l have illustrated a form of bobbin-carrier commonly used or old style braiders in which the bobbins travel in a tortuous course to dodge each other as they pass around the machine in opposite directions. The carrier 75 is provided with a shoe 76 adapted to travel in the grooves of the track-plate of the machine under the impulse of a set of intermeshmg gears which engage one after another with the horn 77 on the shoe. Rising from the shoe 76 is a dead spindle 76 mounting the rotatable co} holder 79 which is provided with a ratchetdisk or toothed brake-wheel 86 at its base.

At one side of the cop-holder 79 is a post or standard 81 on which is mounted a slid able weight 82 of substantially L-shape. At the side of the standard 81 is a pair of vertion the brake-wheel 46.

tending to rock cal arms 83, see Figs. 10 and 11. carrying a cross-pin 8e on which is pivoted a U-shaped pawl-lever 85. The pawl-lever has a curved arm 86 reaching back i om its crossbar 87 in under the pivctpin 8d, and projecting upwardly in the form of detent 88 adapted to engage the teeth on the brake- Wheel 80. Extending betwee: the cpposite, parallel arms of the pawl-lever 85 is a crosspin 89, on which is pivoted a loopshaped tensionlever 90. The lever 90 comprises two opposite, parallel arms 91 straddling the sides of the pawl-lever 85 and extended outwardly. around the base of the bobbinholder in a substantially V-shaped loop having a guide-hook 92 at its apex (Ild- Extending downwardly from one arm 91 of the lever 90 is a finger 93 from the end of which projects a pin 95. The pin 95 engages a V-shaped cam-slot 96 in a plate 97 which depends from the foot of the slidable weight 82. It will be seen that throughthis connection the rocking motion of the tension-lever 90 will eltect an up and down sliding action of the weight 82, the latter serving in this manner as the equivalent of the drop-wire 40 on the carrier 2 to act to cause the stopping of the machine through any suitable knockoff device as well known in the art.

Extending from the side of the crossbar 87 of the lever 85 is a linger 94 adapted to be engaged by one of the arms 91 of the tension-lever 90. Extending inwardly from one of the arms 91 of the lever 90 is a finger 98 to which is attached the end of a helical spring 100 suspended from a hook 101 at the too of the standard 81. Rising from the shoe 76 atthe side of the cop-holder79 is a vertcal rod 102 carrying pigta ls or guideeyes 103 and 10 1 for guiding the strand 6 as it draws off from the bobbin B.

The method of operation of the last-described embodiment of the invention isas follows: The strand 7) draws oil from the bobbin or cop B through the guide-eye 103, is looped under the guide-hook 92 on the tension-lever 90, and thence leads up through the eyes 103 and 104: to the braiding point. As the carriers 75 pursue their tortuous courses in travelino; about the axis of the machine the strand Z) from each cop B must be paid out and taken up again and this action is provided for by the oscillation or play of the tension-lever '90funder the control of the spring 100. The force of the spring 100 on the lever 90 is augmented by the action of gravity on the weight 82, which rises and falls with the movement of the lever, thus applying a greater degree of tension to the strand 7) as required for braidersof the present type. Upon breakage of the strand or when undue hindrance to its delivery, from the cop is encountered the full stroke of the lever 9) in either direction will cause the pin 95 toride out to the end of the cam slot 96 in the plate 97 whereby the we ght 82 will descend to actuate the stopping-mechanism ot the machine in the usual manner. A slight oscillation of the lever 90 to effect the ,Q iv e-and-take of the yarn is continuous during the normal. opera ion of the machine and as'mo're yarn is required for; the braidoperatioh the lever is raised to bring its arm 91 against the fin'gerQ/ L on the pawllever 85 whereby the latter will be rocked to release the detent 88 from the teeth on the brake-wheel 80. The release of the detent from the brake-wheel allows the cop'- holder 79 to rotate to unwind a length of yarn and this action takes place intermit tently to deliver the yarn'practically continuously as required. v

It will bepbserved from the foregoing that the severalembodiments ot the invention as above described provide means for effecting a sensitive and accurate control of the "yarn delivering from the supply cops or bobbins while applying a substantially constant degree of tension thereto. The

n echanism of. the device is particularly simple, compact and economical to manufacture, whi e being proof against derangement or getting out of order. Only one spring 13 employed in each adaptation, and the arrangement is such that a very light tension maynormally be applied to the yarn while providing a greater degree or" resistance to the release of the pawl which controls the unwinding of the bobbin. Moreover, the elimination of additional springs or weights makes for greater uniiormity in the amount of tension applied to all of the individual yarns of the several supplies on the machine, and furthermore the tension on the several yarns may be more conveniently and accurately adjusted to the prescribed common degree.

Various modifications other than those herein shown'may'be made in the form and construction of the parts of the device with out departing ,trom' the spirit or scope of the invention." Therefore, without limiting myself. in this respect. I claim:

,1. In a tension and let-oft device for yarnsupplies, the combination with a rotatable cop or bobbin, of braking-means for controllingthe rotation ofthe bobbin, tensionmeans movable independently of the braking-means under the draft onthe yarn and acting to release the braking-means under extreme movement, and a single resilient means acting on the tension-means to control its movement under the draft on the yarn and also acting onthe tension-means to cause it to apply pressure on the braking-means to normally'maintain the latter active.

2. In a tensionand let otf device'tor yarnsupplies, the combination with a rotatable cop or bobbin, of braking-means for controlling the rotation of the bobbin, tension means having freedom of movement independently of the braking-means under the draft on the yarn but arranged to release the braking-means by its continued movement, and a single resilient means for controlling the action of the tension-means under the draft on the yarn and also acting to cause the tension-means to exert pressure on the braking-means to normally render the latter active.

3. In a tension and let-off device for yarnsupplies, the combination of a rotatable bobbin, detent-means for preventing rotation of the bobbin, atension lever having freedom of movement independently of the detent-means under the. draft on the yarn but operative to release the detent-means at the end of its movement, and a single spring acting on the tension-lever to control its movement under the draft on the yarn and also acting to cause the tension-lever to apply pressure on the detent-means to normally maintain the latter active.

4:. In a device of the character specified, the combination of a carrier, a bobbin rotatable on the carrier, brakingmeans for controlling the rotation of the bobbin, tension-means having freedom of movement n1- dependently of the braking-means but adapted. to be actuated under the continued draft on the yarn to release the braking-means, and a single spring anchored at one. end to the carrier with its opposite end connected to the tension-means to control the. action thereof and also acting on the tension-means to cause it to apply pressure on the braking-means to normally maintain the latter active.

5. In a device of the character specified, the combination of, a carrier, a bobbin rotatable on the carrier, braking-means for controlling the rotation of the bobbin, a tensionlever having freedom of' movement independently of the braking means but acting to release the latter under its continued movement, and a single spring anchored to the carrier and acting on the tension-lever to control its movement while also acting on the tension-lever to cause it to apply pressure on the brakingmeans to normally maintain the latter active.

6. In a device of the chararter specified, the combination of a rotatable bobbinholder, a brake-wheel rotatable therewith, a detent engaging the brake-wheel to resist its rotation, a tension-lever movable independently of the detent under the draft on the yarn but adapted to be moved to release the detent, and a single spring connected to the tension-lever to control its movement under the draft on the yarn and also acting to cause the tensiondever to apply pressure on the detent to normally maintain it operative on the brake-wheel.

(. In a device of the character specified,

the combination of a rotatable bobbinholder, a brake-wheel rotatable therewith, a detent engaging the brake-wheel to resist its rotation, a pivoted tension-lever adapted to h be moved bodily to carry the detent into engagement with the brake-wheel and to rock on its axis to release the detent from such engagement, and a spring connected to the tension-lever to resist its rocking action, said spring also acting to apply pressure tending to shift the tension-lever bodily to cause it to transmit pressure to the detent to normally maintain it operative. on the brake-wheel.

8. In a device of the character specified, the combination of a rotatable cop-holder, a brake-wheel rotatable therewith, a detent engaging the brake-wheel to resist its rotation, a tension-lever connected with the detent and adapted to be moved in one direc tion under the draft on the yarn to release the detent, and a spring tending to shift the tension-lever bodily whereby to apply pressure on the detent to maintain it in engagement with the brake-wheel and also acting: to control the rocking movement of the tension-lever under the draft on the yarn.

9. In a device of the class specified, the combination of a rotatable cop-holder, a brake-wheel rotatable therewith, a pawl-lever pivoted to adapt it to engage the brakewheel, a tension-lever pivoted on the pawl lever at a distance from the axis thereof and adapted to be rocked to release said pawllever from the brake-wheel, and a spring con nected to the tension-lever to resist its rocking motion while also tending to move the tension-lever bodily to exert pressure on the pawl-lever.

10. In a device of the class specified, the combination of a rotatable cop-holder, a brake-wheel rotatable therewith, a detent pivoted to adapt it to engage the brakewheel, a tension-lever pivoted on the detent to adapt it to rock between predetermined limits, means on the detent adapted to be engaged by the tensionlever to release the detent from the brake-wheel, and a spring acting on the tension-lever to resist its rocking motion while also serving to apply pressure to the detent-means tending to maintain it in engagement with the brake-wheel.

11. In a braider-carrier, the combination of a rotatable cop-holder, a brake-wheel rotatable therewith, a detent pivoted on the carrier to adapt it to engage the brake-wheel, a tension-lever pivoted on the detent to adapt it to rock independently thereof and arranged to engage with a portion of the detent to move the latter to release it from the brake-wheel, and a single spring acting to apply pressure to both the detent and tension-lever in the manner and for the purpose specified.

12. In a braider-carrier, the combination of a rotatable cop-holder, a brake wheel rotatable therewith, a detent pivoted on the carrier to adapt it to engage the brake-wheel and formed with a projecting finger, a tension-lever pivoted on the detent to move independently thereof and adapted to engage the finger 0n the detent to rock the latter to release it from the brake-Wheel, and resilient means acting directly on the tensionlever and indirectly on the detent in the 10 manner and for the purpose specified.

In testimony whereof I affix my signature;

CARL V. J. CHRISTENSEN. 

